Quartz 框架的应用

迈不过友情╰ 2022-04-15 00:27 103阅读 0赞

这里是 Quartz在Spring中的简单使用 http://yangpanwww.iteye.com/blog/797563

本文将简单介绍在没有 Spring 的时候..如何来使用 Quartz...

这里跳过 Quartz 的其他介绍。如果想更加输入的了解 Quartz，大家可以点击下载Quartz的帮助文档。

**Quartz 和 Web 集成应用**

第一步： 导入quartz包..这个不用说吧..放到工程的 lib 下面即可

第二步： 添加相应文件和修改web.xml文件的配置.

添加 quartz.properties 和 quartz\_jobs.xml 到 src 下面

quartz.properties文件如下：

#===============================================================     
    #Configure Main Scheduler Properties     
    #===============================================================       
    org.quartz.scheduler.instanceName = QuartzScheduler       
    org.quartz.scheduler.instanceId = AUTO     
     
    #===============================================================     
    #Configure ThreadPool     
    #===============================================================       
    org.quartz.threadPool.threadCount = 5       
    org.quartz.threadPool.threadPriority = 5       
    org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool     
     
    #===============================================================     
    #Configure JobStore     
    #===============================================================       
    org.quartz.jobStore.class = org.quartz.simpl.RAMJobStore     
     
    #===============================================================     
    #Configure Plugins    
    #===============================================================       
    org.quartz.plugin.jobInitializer.class = org.quartz.plugins.xml.JobInitializationPlugin      
    org.quartz.plugins.xml.JobInitializationPlugin = quartz_jobs.xml   
          
    org.quartz.plugin.jobInitializer.overWriteExistingJobs = false      
    org.quartz.plugin.jobInitializer.validating = false      
    org.quartz.plugin.jobInitializer.failOnFileNotFound =true

quartz\_jobs.xml 文件如下

<?xml version="1.0" encoding="UTF-8"?>
    <quartz>
    	<job>
    
    		<job-detail>
    			<name>GatherJob</name>
    			<group>DEFAULT</group>
    			<description>GatherJob</description>
    			<job-class>net.sf.rain.gather.quartz.GatherJob</job-class>
    			<volatility>false</volatility>
    			<durability>false</durability>
    			<recover>false</recover>
    		</job-detail>
    
    		<trigger>
    			<cron>
    				<name>RunQuartzJobTrigger</name>
    				<group>DEFAULT</group>
    				<description>RunQuartzJobTrigger</description>
    				<job-name>RunQuartzJob</job-name>
    				<job-group>DEFAULT</job-group>
    				
    				<cron-expression>0 0 3 * * ?</cron-expression>
    			</cron>
    		</trigger>
    
    	</job>
    </quartz>

注意文件中的配置要正确。比如 job-class 等等。

web.xml的配置：

从 2.3 版本的 Servlet API 开始，你能创建监听器，由容器在其生命周期中的某个特定时间回调。其中的一个监听器接口叫做 java.servlet.ServletContextListener，

WEB.xml

<context-param>
    		<param-name>config-file</param-name>
    		<param-value>/quartz.properties</param-value>
    	</context-param>
    
    	<context-param>
    		<param-name>shutdown-on-unload</param-name>
    		<param-value>true</param-value>
    	</context-param>
    
    	<context-param>
    		<param-name>start-scheduler-on-load</param-name>
    		<param-value>true</param-value>
    	</context-param>
    	
    	
    	<listener>  
    	   <listener-class>  
    	  		net.sf.rain.gather.quartz.QuartzServletContextListener   
    	   </listener-class>  
    	</listener>

下面我们将实现这个监听器   QuartzServletContextListener

package net.sf.rain.gather.quartz;
    
    import javax.servlet.ServletContext;
    import javax.servlet.ServletContextEvent;
    import javax.servlet.ServletContextListener;
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.quartz.SchedulerException;
    import org.quartz.impl.StdSchedulerFactory;
    
    public class QuartzServletContextListener implements ServletContextListener {
    
    	private static  Log _log = LogFactory.getLog(QuartzServletContextListener.class);
    
    	public static final String QUARTZ_FACTORY_KEY = "org.quartz.impl.StdSchedulerFactory.KEY";
    	private ServletContext ctx = null;
    	private StdSchedulerFactory factory = null;
    
    	/**
    	 * Called when the container is shutting down. 
    	 */
    	public void contextDestroyed(ServletContextEvent sce) {
    		try {
    			factory.getDefaultScheduler().shutdown();
    		} catch (SchedulerException ex) {
    			_log.error("Error stopping Quartz", ex);
    		}
    	}
    
    	
    	/**
    	 * 容器的第一次启动时调用
    	 */
    	public void contextInitialized(ServletContextEvent sce) {
    		ctx = sce.getServletContext();
    		try {
    			factory = new StdSchedulerFactory();
    			// Start the scheduler now
    			//设置容器启动时不立即启动定时器，而是到后台人工启动
    			//factory.getScheduler().start();
    			_log.info("Storing QuartzScheduler Factory at" + QUARTZ_FACTORY_KEY);
    			ctx.setAttribute(QUARTZ_FACTORY_KEY, factory);
    
    		} catch (Exception ex) {
    			_log.error("Quartz failed to initialize", ex);
    		}
    	}
    
    }

下面的Action将管理定时器的状态

package net.sf.rain.gather.quartz;
    
    import java.io.PrintWriter;
    
    import javax.servlet.ServletContext;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.commons.lang.StringUtils;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.struts.action.Action;
    import org.apache.struts.action.ActionForm;
    import org.apache.struts.action.ActionForward;
    import org.apache.struts.action.ActionMapping;
    import org.quartz.Scheduler;
    import org.quartz.SchedulerException;
    import org.quartz.impl.StdSchedulerFactory;
    
    /**
     * 
     * 调度器管理 
     * 
     * @author 妞见妞爱
     *
     */
    public class GatherJobAction extends  Action{
    
    	private static  Log _log = LogFactory.getLog(GatherJobAction.class);
    	
    	public ActionForward execute(ActionMapping mapping, ActionForm form,
    			HttpServletRequest request, HttpServletResponse response)
    			throws Exception {
    		
    		request.setCharacterEncoding("UTF-8");
    		response.setContentType("text/html;charset=UTF-8");
    		
    		String action = request.getParameter("action");
    		  
            
            String retMsg = "Parameter Error: action is null";
            if (StringUtils.isNotBlank(action)) {
        		ServletContext ctx =  request.getSession().getServletContext();
                // Retrieve the factory from the ServletContext   
                StdSchedulerFactory factory =  (StdSchedulerFactory)ctx.getAttribute(QuartzServletContextListener.QUARTZ_FACTORY_KEY);   
                // Retrieve the scheduler from the factory   
                Scheduler scheduler = factory.getScheduler(); 
                
            	if ("start".equals(action)) {
        			// Start the scheduler 
        	        try {
        	        	 if (!scheduler.isStarted()) {
        	        		 scheduler.start();
        	        	 }
        	        	 retMsg = "Quartz Successful to startup";
        			 } catch (SchedulerException ex) {
        				 _log.error("Error starting Quartz", ex);
        				 retMsg = "Quartz failed to startup";
        			 }
        		}else if("stop".equals(action)){
        			try {
        				if (scheduler.isStarted()) {
        					scheduler.shutdown();
        				}
        				retMsg = "Quartz Successful to stopping";
        			 } catch (SchedulerException ex) {
        				_log.error("Error stopping Quartz", ex);
        				retMsg = "Quartz failed to stopping";
        			 }
        		}else { //查看调度器的状态
    				if (scheduler.isStarted()) {
    					retMsg = "Quartz is Started";
    				}else {
    					retMsg = "Quartz is Stoped";
    				}
    			}
    		}
            
    		PrintWriter out = response.getWriter();
    		out.print(retMsg);
    		out.flush();
    		out.close();
    		
    		return null;
    	}
    
    
    }

有点事情。。忙会。。哈哈。。应该差不多了。。。。